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Diffusion of Cesium and Iodine in Compacted Sodium Montmorillonite Under Different Saline Conditions

Published online by Cambridge University Press:  15 February 2011

Yukio Tachi ,
Kenji Yotsuji ,
Yoshimi Seida  and
Mikazu Yui
Yukio Tachi
Affiliation:
Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency 4-33 Muramatsu, Tokai-mura, Ibaraki 319-1194, Japan
Kenji Yotsuji
Affiliation:
Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency 4-33 Muramatsu, Tokai-mura, Ibaraki 319-1194, Japan
Yoshimi Seida
Affiliation:
Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency 4-33 Muramatsu, Tokai-mura, Ibaraki 319-1194, Japan
Mikazu Yui
Affiliation:
Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency 4-33 Muramatsu, Tokai-mura, Ibaraki 319-1194, Japan
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Abstract

Diffusion and sorption of cesium (Cs) and iodine (I) were investigated in a purified and moderately compacted sodium montmorillonite (dry density of 800 kg m-3) saturated with 0.01, 0.1 and 0.5M NaCl solutions. The effective diffusivity (De) and capacity factor (α) for Cs and I were measured by through-diffusion experiments, coupled with multiple curve analyses, including tracer depletion, breakthrough and depth concentration curves, which could be fitted with a conventional diffusion model using only one set of parameters. The De values obtained for Cs were of the order of 10-9-10-10 m2 s-1 and decreased as salinity increased, and those for I were of the order of 10-11-10-12 m2 s-1 and showed the opposite dependency. The distribution coefficient (Kd) of Cs decreased from the order of 100 to 10-2 m3 kg-1 as salinity increased. Diffusion and sorption parameters for Cs were also obtained by in-diffusion and batch sorption experiments and showed good agreement with those obtained by the through-diffusion experiments. The diffusion model, based on homogeneous pore structure and electrical double layer (EDL) theory, predicted the salinity dependence of De reasonably well, showing the effect of cation excess and anion exclusion as a function of salinity. The apparent diffusivity (Da), which includes sorption effects, was also interpreted by a coupled sorption model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1193: Scientific Basis for Nuclear Waste Management XXXIII , 2009 , 545
Copyright
Copyright © Materials Research Society 2009

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